diff --git a/.cirrus.yml b/.cirrus.yml
index e0f1fa8db..0a04ad6cd 100644
--- a/.cirrus.yml
+++ b/.cirrus.yml
@@ -11,7 +11,7 @@ task:
     - mkdir build
     - cd build
     - cmake --version
-    - cmake ../ -DBUILD_MAN=0 -DBUILD_TEST_SUITE=1
+    - cmake ../ -DBUILD_MAN=0 -DBUILD_TEST_SUITE=1 -DENABLE_WERROR=1
 
   build_script:
     - cd build
diff --git a/.github/workflows/ci-xenial.yml b/.github/workflows/ci-xenial.yml
index f24623488..4ea605267 100644
--- a/.github/workflows/ci-xenial.yml
+++ b/.github/workflows/ci-xenial.yml
@@ -20,6 +20,6 @@ jobs:
       - name: Prepare
         run: mkdir build
       - name: Configure
-        run: cd build && cmake --version && cmake .. -DBUILD_MAN=0
+        run: cd build && cmake --version && cmake .. -DBUILD_MAN=0 -DENABLE_WERROR=1
       - name: Build
         run: cd build && make -j3 | grep --line-buffered -Ev '^(cp lib\/|Installing.+\.pm)' && (exit ${PIPESTATUS[0]})